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设A,B,C为三个随机事件,且P(A)=P(B)=P(C)=1/4,P(AB)=0,P(AC)=P(BC)=1/12,则A,B,C中恰有一个事件发生的概率为()
ShegotajobasanassistantstagemanagerattheCambridgeArtsFestivalTheatre,thinkingthatitmight________toacareerasaplaywright(剧作家).
设曲线y=ax^2+2x在点(1,a+2)处的切线与直线y=4x平行，则a=（）
Iboughtthiseighteenthcenturywritingdeskataquite________price.
Theproblem________whenthestudentsrefusedtodotheirhomework.
